Factory stereo problems -want to fix prior to upgrading
09-03-2003, 11:44 PM
#1
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Posts: n/a
Factory stereo problems -want to fix prior to upgrading
I recently purchased a 2000 wrangler SE and am about to put a lot of $$$ into
it. The first thing that I'm looking at is the stereo. It's the stock AM/FM
cassette job. Here's what's buggin' me...AM is fine-crystal clear. Cassette
is fine-crystal clear. FM has a whole lot of alternator noise. What could be
causing this? and should I fix this prior to getting a CD system? Shouldn't
the noise be on everything if it's from the alternator? any help would be
appreciated!
Keepin' Jeepin'
Gardner
it. The first thing that I'm looking at is the stereo. It's the stock AM/FM
cassette job. Here's what's buggin' me...AM is fine-crystal clear. Cassette
is fine-crystal clear. FM has a whole lot of alternator noise. What could be
causing this? and should I fix this prior to getting a CD system? Shouldn't
the noise be on everything if it's from the alternator? any help would be
appreciated!
Keepin' Jeepin'
Gardner
09-04-2003, 12:00 AM
#2
Guest
Posts: n/a
Re: Factory stereo problems -want to fix prior to upgrading
"Beasleys3" <beasleys3@aol.com> wrote in message
news:20030903234447.08154.00000489@mb-m14.aol.com...
> I recently purchased a 2000 wrangler SE and am about to put a lot of $$$
into
> it. The first thing that I'm looking at is the stereo. It's the stock
AM/FM
> cassette job. Here's what's buggin' me...AM is fine-crystal clear.
Cassette
> is fine-crystal clear. FM has a whole lot of alternator noise. What
could be
> causing this? and should I fix this prior to getting a CD system?
Shouldn't
> the noise be on everything if it's from the alternator? any help would be
> appreciated!
You need a special feed-through capacitor that kills alternator noise. It
bolts to the alternator case and you splice it into the big red wire.
"noise suppression" car stereo and you'll probably find something.
Evidently
it's up in the 100MHz region where FM lives... FM should be immune to
this noise (it's AM noise, after all) but there's no allowing for cheapness.
__
Steve
(KI5YG)
..
09-04-2003, 12:00 AM
#3
Guest
Posts: n/a
Re: Factory stereo problems -want to fix prior to upgrading
"Beasleys3" <beasleys3@aol.com> wrote in message
news:20030903234447.08154.00000489@mb-m14.aol.com...
> I recently purchased a 2000 wrangler SE and am about to put a lot of $$$
into
> it. The first thing that I'm looking at is the stereo. It's the stock
AM/FM
> cassette job. Here's what's buggin' me...AM is fine-crystal clear.
Cassette
> is fine-crystal clear. FM has a whole lot of alternator noise. What
could be
> causing this? and should I fix this prior to getting a CD system?
Shouldn't
> the noise be on everything if it's from the alternator? any help would be
> appreciated!
You need a special feed-through capacitor that kills alternator noise. It
bolts to the alternator case and you splice it into the big red wire.
"noise suppression" car stereo and you'll probably find something.
Evidently
it's up in the 100MHz region where FM lives... FM should be immune to
this noise (it's AM noise, after all) but there's no allowing for cheapness.
__
Steve
(KI5YG)
..
09-04-2003, 02:18 PM
#4
Guest
Posts: n/a
Re: Factory stereo problems -want to fix prior to upgrading
Approximately 9/3/03 20:44, Beasleys3 uttered for posterity:
> I recently purchased a 2000 wrangler SE and am about to put a lot of $$$ into
> it. The first thing that I'm looking at is the stereo. It's the stock AM/FM
> cassette job. Here's what's buggin' me...AM is fine-crystal clear. Cassette
> is fine-crystal clear. FM has a whole lot of alternator noise. What could be
> causing this? and should I fix this prior to getting a CD system? Shouldn't
> the noise be on everything if it's from the alternator? any help would be
> appreciated!
The noise can get into the radio two ways. Check and/or add
bypass caps at the alternator itself so it can't radiate noise
to be picked up by the I/F of the radio. You may also need
to add or replace a bypass at the DC power to the radio itself.
If not familiar, local car audio shop should be able to help.
With the caution that noise suppression is often counterintuitive.
> I recently purchased a 2000 wrangler SE and am about to put a lot of $$$ into
> it. The first thing that I'm looking at is the stereo. It's the stock AM/FM
> cassette job. Here's what's buggin' me...AM is fine-crystal clear. Cassette
> is fine-crystal clear. FM has a whole lot of alternator noise. What could be
> causing this? and should I fix this prior to getting a CD system? Shouldn't
> the noise be on everything if it's from the alternator? any help would be
> appreciated!
The noise can get into the radio two ways. Check and/or add
bypass caps at the alternator itself so it can't radiate noise
to be picked up by the I/F of the radio. You may also need
to add or replace a bypass at the DC power to the radio itself.
If not familiar, local car audio shop should be able to help.
With the caution that noise suppression is often counterintuitive.
09-04-2003, 02:18 PM
#5
Guest
Posts: n/a
Re: Factory stereo problems -want to fix prior to upgrading
Approximately 9/3/03 20:44, Beasleys3 uttered for posterity:
> I recently purchased a 2000 wrangler SE and am about to put a lot of $$$ into
> it. The first thing that I'm looking at is the stereo. It's the stock AM/FM
> cassette job. Here's what's buggin' me...AM is fine-crystal clear. Cassette
> is fine-crystal clear. FM has a whole lot of alternator noise. What could be
> causing this? and should I fix this prior to getting a CD system? Shouldn't
> the noise be on everything if it's from the alternator? any help would be
> appreciated!
The noise can get into the radio two ways. Check and/or add
bypass caps at the alternator itself so it can't radiate noise
to be picked up by the I/F of the radio. You may also need
to add or replace a bypass at the DC power to the radio itself.
If not familiar, local car audio shop should be able to help.
With the caution that noise suppression is often counterintuitive.
> I recently purchased a 2000 wrangler SE and am about to put a lot of $$$ into
> it. The first thing that I'm looking at is the stereo. It's the stock AM/FM
> cassette job. Here's what's buggin' me...AM is fine-crystal clear. Cassette
> is fine-crystal clear. FM has a whole lot of alternator noise. What could be
> causing this? and should I fix this prior to getting a CD system? Shouldn't
> the noise be on everything if it's from the alternator? any help would be
> appreciated!
The noise can get into the radio two ways. Check and/or add
bypass caps at the alternator itself so it can't radiate noise
to be picked up by the I/F of the radio. You may also need
to add or replace a bypass at the DC power to the radio itself.
If not familiar, local car audio shop should be able to help.
With the caution that noise suppression is often counterintuitive.
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